| 摘要 |
PROBLEM TO BE SOLVED: To safely provide information including BIOS picture information in a network. SOLUTION: A code provider 105 signs code information to be transmitted and transmits signed code information to the network. The management node 110 of the network executes the propriety inspection of received code information, executes signing and packaging and judges whether code information is transmitted to only the management node or transmitted also to another non-management node 115. When non-management node is the object of code information, packaged code information is transmitted from the management node to the non-management node and propriety inspection is executed there. After that, the node to be the object of code information becomes a secrecy state so as to execute propriety inspection again and stores picture information in a memory only at the time of authentication. At the time of non- authentication, code information is adopted as the one being changed by a tamper sources 120, 125 and code contaminating sources 130, 135 so as to abondon information. |
